Opt

Updated: 10/02/2017 by Computer Hope

Opt is a term used to describe a user's acceptance or participation of a program. For example, a user who chooses to opt-in to an e-mailnewsletter will start receiving that newsletter until they choose to opt-out.
Many e-mail solicitations sent by companies offer a way to opt-out from
further correspondence by clicking 'unsubscribe'.